Remove stray pixels

D
Posted By
DanielPalm
Nov 24, 2006
Views
516
Replies
3
Status
Closed
Hi all,

I have a large wiring diagram with black and white pixels only.

I want to remove the noise pixels outside the actual lines and letter/numbers. How do I do that when the noise have the same color as the actual content?
Related Tags
pixel remove

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RK
Rob_Keijzer
Nov 24, 2006
Daniel,

Try the Median filter (Filter-Noise-Median).

There are probably hundreds of methods to do this.

For instance I would try to resize the image to 50%, then resize back to the original size. Maybe it still looks good after that. maybe you can tidy up the remaining bits by hand.

BTW I wouldn’t apply voltage to this schematic before retouching! 🙂

Rob
D
DanielPalm
Nov 24, 2006
Thanks Rob,

Median worked fine.
RK
Rob_Keijzer
Nov 24, 2006
You’re welcome.

I suspect this is a one-bit (two colour) scan. Next time scan full colour (everything, no matter the purpose) and reduce in PS.

It’s better to clip the whites and blacks in a 16bit file (and then reduce to 1bit) than let the scanner decide where the threshold lies.

My rule of thumb is never to reduce in an input device (camera, scanner) but allways in PS.

Rob

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